期刊
ADVANCED SCIENCE
卷 5, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/advs.201700614
关键词
atomic layer deposition; electron transport layers; phase junctions; perovskites; titanium oxide
资金
- National Natural Science Foundation of China [51772197, 51422206, 51372159]
- 1000 Youth Talents Plan, Key University Science Research Project of Jiangsu Province [17KJA430013]
- 333 High-level Talents Cultivation Project of Jiangsu Province
- Six Talents Peak Project of Jiangsu Province
- Natural Science Foundation of Jiangsu [BK20140009, BE2015090]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
In the planar perovskite solar cells (PSCs), the electron transport layer (ETL) plays a critical role in electron extraction and transport. Widely utilized TiO2 ETLs suffer from the low conductivity and high surface defect density. To address these problems, for the first time, two types of ETLs based on TiO2 phase junction are designed and fabricated distributed in the opposite space, namely anatase/rutile and rutile/anatase. The champion efficiency of PSCs based on phase junction ETL is over 15%, which is much higher than that of cells with single anatase (9.8%) and rutile (11.8%) TiO2 as ETL. The phase junction based PSCs also demonstrated obviously reduced hysteresis. The enhanced performance is discussed and mainly ascribed to the excellent capability of carrier extraction, defect passivation, and reduced recombination at the ETL/perovskite interface. This work opens a new phase junction ETL strategy toward interfacial energy band manipulation for improved PSC performance.
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